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The number of moles of NaCl in 3 litres ...

The number of moles of NaCl in 3 litres of 3 M solution is:

A

1

B

3

C

9

D

27

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The correct Answer is:
C
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The concentrations of soluitons can be expressed in number of ways , viz : mass fraction of solute (or mass percent), Molar concentration (Molarity ) and Molal concentration (molality). These terms are known as concentration terms and also they are related with each otehr i.e., knowing one concentration terms for the solution, we can find other concentration terms also. the definition of different cencentration terms are given below: Molarity : It is number of moles of solute present in one litre of the solution. Molality : It is the number of moles of solute present in one kg of the solvent. Mole fraction =("Mole of solute")/("Moles of solute" + "Moles of solvent") If molality of the solution is given as a, then mole fraction of the solute can be calculated by Mole Fraction =(a)/(a+(100)/(M_("solvent"))),=(axxM_("solvent"))/((a xx M_("solvent")+1000)0 where a=molality and M_("solvent") =Molar mass of solvent We can change : Mole fraction hArr Molality hArr Molarity Percentage (weight/vol) of NaCl persent in the solution is :

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MODERN PUBLICATION-SOLUTIONS-REVISION EXERCISES (MULTIPLE CHOICE QUESTIONS)
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  4. CaCl(2) is used as

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  7. Which of the following aqueous solutions will have the minimum freezi...

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  8. Which has the minimum freezing point ?

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  9. Mole fraction of a solute in 2.5 molal aqueous solution is

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  16. The units of ebullioscopic constant is.

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  17. Molar solution means 1 mole of solute present in

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  18. Increasing the temperature of an aqueous solution wil case

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  19. Colligative properties depend on

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  20. Molal elevation constant.

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